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ledger.py
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ledger.py
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#!/usr/bin/env python3
# Ledger: Double-entry accounting system
# Copyright (C) 2020 Gokberk Yaltirakli
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option) any
# later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
# details.
#
# You should have received a copy of the GNU Affero General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
import sys
from collections import defaultdict
from decimal import Decimal
import os
# File parser
class Block:
def __init__(self, lines):
self.lines = lines
def __bool__(self):
return len(self.lines) != 0
@property
def is_comment(self):
try:
return self.lines[0][0] in ";#%|*"
except Exception:
return False
@property
def date(self):
try:
return self.lines[0].split(" ", 2)[0]
except Exception:
return "1970-01-01"
@property
def name(self):
try:
return self.lines[0].split(" ", 2)[1].lower()
except Exception:
return ""
@property
def arg(self):
try:
return self.lines[0].split(" ", 2)[2]
except Exception:
return ""
@property
def children(self):
return self.lines[1:]
def __repr__(self):
if self:
return f"[{self.name}] ({self.arg}) {self.children}"
return "Block(Empty)"
class BlockLexer:
def __init__(self, reader):
self.reader = reader
@staticmethod
def indented(line):
return line.startswith(" ")
@property
def lines(self):
for line in self.reader:
line = line.rstrip()
if not line:
continue
yield line
def __iter__(self):
block = []
for line in self.lines:
ind = BlockLexer.indented(line)
if ind:
block.append(line.strip())
else:
yield Block(block)
block = [line]
yield Block(block)
def read_blocks(path):
with open(path) as f:
yield from BlockLexer(f)
# Ledger and bookkeeping logic
def warn_strict(message, condition=True):
if args.strict and condition:
print(f"[WARNING] {message}")
class Ledger:
def __init__(self):
self.commodities = set()
self.accounts = defaultdict(lambda: defaultdict(lambda: Decimal(0)))
self.rates = defaultdict(lambda: Decimal(0))
def process_block(self, block):
if not block:
return
if block.is_comment:
return
if block.name == "nop":
# No operation
return
if block.name == "commodity":
com = block.arg.split(" ", 1)[0]
warn_strict(
f"Duplicate commodity '{com}'", com in self.commodities
)
self.commodities.add(com)
elif block.name == "txn":
self.process_transaction(block)
elif block.name == "include":
for bl in read_blocks(block.arg):
self.process_block(bl)
elif block.name == "assert-balance":
name, amt, com = block.arg.split()
amt = Decimal(amt)
bal = self.accounts[name][com]
warn_strict(
f"Expected balance for {name} is {amt}, found {bal}",
bal != amt,
)
elif block.name == "balance":
name, amt, com = block.arg.split()
amt = Decimal(amt)
bal = self.accounts[name][com]
if bal == amt:
return
if bal > amt:
self.accounts["Expenses:ForceBalance"][com] += bal - amt
self.accounts[name][com] -= bal - amt
elif amt > bal:
self.accounts["Income:ForceBalance"][com] -= amt - bal
self.accounts[name][com] += amt - bal
elif block.name == "price":
com1, rate, com2 = block.arg.split()
self.rates[(com1, com2)] = Decimal(rate)
else:
warn_strict(f"Unknown directive '{block.name}'")
def process_transaction(self, block):
total = defaultdict(lambda: Decimal())
for line in block.children:
if len(line.split()) == 1:
account = line
for com in total:
self.accounts[account][com] -= total[com]
total[com] = 0
else:
account, amount, commodity = line.split(" ", 2)
warn_strict(
f"Unknown commodity '{commodity}'",
commodity not in self.commodities,
)
total[commodity] += Decimal(amount)
self.accounts[account][commodity] += Decimal(amount)
# print(block)
# self.consistency_check()
def consistency_check(self):
total = defaultdict(lambda: Decimal())
for name in self.accounts:
for com in self.accounts[name]:
amt = self.accounts[name][com]
total[com] += amt
for com in total:
assert total[com] == 0, f"{total[com]} {com}"
# Command line interface
class Arguments:
def __init__(self, args=None):
if args is None:
args = sys.argv[1:]
self.args = list(args)
self.file = self.args.pop(0)
self.action = self.args.pop(0)
@property
def accounts(self):
accounts = []
for arg in self.args:
a = arg.startswith("-")
if not a:
accounts.append(arg)
return accounts
def filtered_accounts(self, ledger):
accounts = sorted(ledger.accounts)
if args.accounts:
act = []
for account in accounts:
if any(map(lambda x: account.startswith(x), self.accounts)):
act.append(account)
return act
return accounts
@property
def strict(self):
return "--strict" in self.args
subcommands = {}
def subcommand(name=None):
def decorator(func):
subcommands[name or func.__name__] = func
return decorator
@subcommand()
def check():
ledger.consistency_check()
@subcommand()
def accounts():
for name in args.filtered_accounts(ledger):
print(name)
@subcommand()
def balance():
total = defaultdict(lambda: Decimal())
accounts = args.filtered_accounts(ledger)
w = max(accounts, key=lambda x: len(x))
w = len(w)
for name in accounts:
for com in sorted(ledger.accounts[name]):
amt = ledger.accounts[name][com]
total[com] += amt
if amt != 0:
print(f"{name: <{w}} {amt} {com}")
print("\nTotal:")
for com in total:
amt = total[com]
if amt != 0:
print(f" {amt} {com}")
def print_table(table, fmt=None):
table = [[str(x) for x in row] for row in table]
col_num = len(max(table, key=len))
col_w = [0 for _ in range(col_num)]
if not fmt:
fmt = [">" for _ in range(col_num)]
for col in range(col_num):
col_w[col] = len(max(map(lambda x: x[col], table), key=len))
for row in table:
for i, col in enumerate(row):
print(f"{col: {fmt[i]}{col_w[i]}}", end=" ")
print()
@subcommand("converted-balance")
def convertedbalance():
accounts = args.filtered_accounts(ledger)
w = max(accounts, key=len)
w = len(w)
rates = ledger.rates
for _ in range(10):
for com1, com2 in dict(rates):
rel = (com1, com2)
rev = (com2, com1)
if rates[rev] == 0:
rates[rev] = 1 / rates[rel]
def conv_rate(com1, com2):
q = []
discovered = set()
parents = {}
amt = 1
discovered.add(com1)
q.append(com1)
while len(q):
v = q.pop()
if v == com2:
amt = 1
n = com2
while n in parents:
amt *= rates[(parents[n], n)]
n = parents[n]
return amt
for _com1, _com2 in filter(lambda x: x[0] == v, rates):
if _com2 not in discovered:
discovered.add(_com2)
q.append(_com2)
parents[_com2] = _com1
return 0
for target in os.environ.get("CURRENCY", "EUR,TRY,USD").split(","):
grand_total = 0
totals = {}
for name in accounts:
total = 0
for com in ledger.accounts[name]:
amt = ledger.accounts[name][com]
if amt != 0:
conv = conv_rate(com, target)
total += amt * conv
grand_total += total
if total != 0:
totals[name] = total
table = []
table.append(["Name", "Total", "Currency", "Percentage %"])
table.append(["----", "-----", "--------", "------------"])
for name in totals:
total = totals[name]
row = []
row.append(name)
row.append(f"{total:.2f}")
row.append(target)
perc = total / grand_total * 100
row.append(f"{perc:.2f}")
table.append(row)
table.append(["----", "-----", "--------", "------------"])
table.append(["Total", f"{grand_total:.2f}", target, "100"])
print_table(table, ["<", ">", "<", ">"])
print("\n")
args = Arguments()
ledger = Ledger()
blocks = read_blocks(args.file)
for block in sorted(blocks, key=lambda x: x.date):
ledger.process_block(block)
subcommands[args.action]()